Have I ordered the wrong wiper blades

[mrvillicus]

Hi chaps

bit of a noob question as usual from me,

i bought some blades off ECP but they are the wrong ones



my car currently has aero blades on and from what I read that means it has aero arms too. Can i remove the top aero attachment from the wiper arm to reveal the traditional hook attachment or shall I either:-

Buy normal arms with the hook attachment or
Buy aero blades and not normal ones?

Thanks, Ben